sponsored by psychohistorian.org


Deep Sky Observer's Companion – the online database


Welcome, guest!

If you've already registered, please log in,

or register an observer profile for added functionality.


log in to manage your observing lists























Full database:

Entire DOCdb database of 18,816 objects.



NGC 205 (430 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




finder chart

altitude today

altitude (year)


½°, , in DOCdb

Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/yivumoo/public_html/show_object.php on line 167

Warning: fopen(/home/yivumoo/public_html/logs/showobject/20211018.txt): failed to open stream: Disk quota exceeded in /home/yivumoo/public_html/show_object.php on line 168

Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/yivumoo/public_html/show_object.php on line 181

Warning: fclose() expects parameter 1 to be resource, boolean given in /home/yivumoo/public_html/show_object.php on line 182

show browsing

Messier 110

NGC 205, LEDA 2429, MCG+07-02-014, UGC 426, Messier 110, V 18, h 44, GC 105

RA: 00h 40m 22s
Dec: +41° 41′ 7″

Con: Andromeda
Ch: MSA:105, U2:60, SA:4


(reference key)

Type: galaxy, dE

Mag: B=9.4, V=?

Size: 18.62′ x 11.48′
PA: 170°

Image gallery

Photos  (1)

Select a photo and click the button to view


One of the four satellite galaxies of the Andromeda Spiral, NGC 224 (M31) This dwarf elliptical is the second brightest of the four, and a 3" refractor shows it as an oval blob of light some 35' North West of the nucleus of M31. Although Messier was one of the first observers to glimpse this object in 1773, he did not include it in his catalogue. Visually, the galaxy has an angular size of 8.0' by 3.0', and according to Sanford it measures 17'x10'.

Historical observations

William Herschel (c.1784)

Discovered by Caroline Herschel.

Synonyms: H V-018

Observed in 1784 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "vB, mE, 30' long, 12' broad."

Birr Castle/Lord Rosse

Observations with the 72-inch f/8.8 speculum telescope at Birr Castle noted "Oct 16, 1855. vL; mE np by sf; sharp nucleus, for some distance round which, the neb. is bright and then suddenly decreases; there is a bright star np the nucleus; and another involved in sf end; another in preceding border. Nov 2, 1850. Spirality suspected."

Webb, T.W. (1893)

In the 5th edition of Webb's Celestial Objects for Common Telescopes it is described as "large faint obal neb. best with low powers; resolved by Bond: a very large field includes it with NGC 221 and NGC 224. Seems to sparkle; much more oval and less spindle-shaped that as drawn by Bond."

Published comments

Dekel, A. & Silk, J. (1986)

Mentioned in: Dekel, A. & Silk, J. (1986) The origin of dwarf galaxies, cold dark matter and biased galaxy formation. Astrophys.J., 303, 39-55.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 10.0 mag galaxy. Their coded description reads LGEBE,EL,BM,M31 NEAR.

Sandage, A. (1961) The Hubble Atlas of Galaxies

This galaxy appears on page 3 of "The Hubble Atlas of Galaxies" by Allan Sandage (1961, Washington, DC).

Doig, P. (1925)

Doig, P. (1925) Notes on the nebulae and clusters in Webb's 'Celestial Objects for Common Telescopes' (Sixth edition, Vol.ii). Part I. M.N.R.A.S., 35(5), 159.

Schmidt, K.-H. et al. (1993)

Schmidt K.-H., Priebe A. & Boller T. (1993) Nearby galaxies. Revised machine-readable version of the catalogue. Astron. Nachr., 314, 371. [1993AN....314..371S]

Other names: "U426,M110". Inclination: (face-on, in degrees) 58 Total photoelectric blue mag 8.92 Total colour index .85 Logarithm of the angular diameter D25 (arcminutes) 2.34 Blue photographic magnitude 8.93 This galaxy is included in a sample of galaxies with velocity less than 500km/s with respect to the centroid of the Local Group. [Nearby Galaxies. Schmidt K.-H., Priebe A., Boller T. (Astron. Nachr. 314, 371 (1993))]

Modern observations

Ancient City Astron.Club (1980)

Listed by the Herschel Club, described as "a lovely oval shape with bright nucleus, nebulosity surrounding it noticeable. 8-inch, 70x."

Mullaney, J

Mullaney writes that it can be glimpsed in a 60mm refractor at 30x on a dark night.

Hartung, E.J. (1968) Astron.Obj.South.Tel

Hartung notes: "It is low for southern observers, but not difficult for small apertures; 30cm shows a fairly bright diffuse luminous haze 3' x 2' with no apparent structure, rising broadly to the centre. The field is sprinkled with stars."

Harrington, Phil

Phil Harrington (1990, Touring the Universe through Binoculars) notes that "although catalogues list it as being slightly brighter than M32, M110 is far more difficult to glimpse due to its low surface brightness . . . to spot M110, larger glasses are a must. Look for a nondescript oval glow to the northwest of M31."

Tom Lorenzin

Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes "8M; 17'x 10' extent; large, amorphous, faint, oblong blob; faintly brighter toward center; companion of, and 35' NW of the core of M-31; a member of the local group along with M-31, M-32, N147 and N185; good supernova prospect; photo @ HAG-3"

Brian Skiff

6cm - lg w/broad concen, elong ~N-S, 4'x2' with no nuc.

- lgr than M32. diffuse, barely concen. elong NW-SE. two *s 3'-4' S.

7cm - consp lg oval @ 30x. best @ 50x: elong pa165, halo reaches S as far as more distant of the two m10.5-11 *s along SW flank. min axis is 1.5x sep of these two *s. wk even concen, but also a f sub*ar pip stands out as nuc w/averted vis. BS, 25Nov1992, Anderson Mesa.

15cm - velong N-S. 10'x3' in dk sky, diffuse all over.

25cm - best @ 90x, 10'x3'. core distinguishable, 3'x2', but no sharp cen condensation. pa165. BS.

- 9'x3' oval, diffuse, fades smoothly to sky. hardly brtr across center. BS, 14Oct1982, Anderson Mesa.

30cm - lg and broad w/little concen. 5'x2'.5 in pa150. many *s assoc in neb, one in S end. occas f *ing in center. granular. CBL.

Clark, R.N. (1990)

See also "Visual Astronomy of the Deep Sky" by Roger N. Clark (1990, Sky Publishing Corporation) page 68.

Contemporary observations

Magda Streicher

(no date)

Alldays (22.50S, 20.12E, 770m).

12-inch f/10 SCT (95x)

Independently discovered by Carolina and Charles Messier, NGC 205 also known as M110, the NW companion of M31 the great galaxy in Andromeda. This beautiful soft oval covered in haziness, displays a rather bright nucleus (218x). It has a lower surface brightness because its light is spread across a larger area. Haziness around. Cover almost half my field of view

Tom Bryant

2007-01-08 19:00:00

Observing site: Little Tycho Observatory

Telescope: C-8

[0h 40m 24s, 41 41m 0s] A barely perceptible glow against the brightly glowing background of the light polluted sky. This was the third or forth time I had looked for M 110, and tonight it was finally seen. Swinging the telescope back and forth in RA made the faint glow a bit more apparent.

Favourite lists

Lacaille's catalogue

The Messier objects

Dunlop's catalogue

The Bennett objects

The Caldwell list

Named DSOs

Object search

First search phrase


Second search phrase

Type of object to include:

open cluster
globular cluster
planetary nebula
bright nebula
dark nebula
galaxy cluster
asterism & stars

The Bug Report

DOCdb is still in beta-release.

Known issues, feature requests, and updates on bug fixes, are here:

> Bug Report


Found a bug? Have a comment or suggestion to improve DOCdb? Please let us know!

> Contact us


DOCdb is a free online resource that exists to promote deep sky observing.

You could help by sharing your observations, writing an article, digitizing and proof-reading historical material, and more.

> Find out more

Everything on DOCdb.net is © 2004-2010 by Auke Slotegraaf, unless stated otherwise or if you can prove you have divine permission to use it. Before using material published here, please consult the Creative Commons Attribution-Non-Commercial-Share Alike 2.5 License. Some material on DOCdb is copyright the individual authors. If in doubt, don't reproduce. And that goes for having children, too. Please note that the recommended browser for DOCdb is Firefox 3.x. You may also get good results with K-Meleon. Good luck if you're using IE. A successful experience with other browsers, including Opera and Safari, may vary.

Warning: Unknown: open(/tmp/sess_988311eead1b8cab8ca213c6a9800f1c, O_RDWR) failed: Disk quota exceeded (122) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct () in Unknown on line 0